The Forge of Souls (52.5, 89.4) is the first wing of the Frozen Halls instances in Icecrown Citadel, released in patch 3.3. The Forge is a massive production facility that builds Soul Grinders, the latest foul construct in the Lich King's arsenal.

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Serving as the first wing in this expansive dungeon, the Forge of Souls will quickly put players to the test of carving through the Scourge stronghold into deeper, more treacherous locations. Jaina will command Alliance forces, and Sylvanas will direct Horde forces. The goal is to ruin the twisted engines known as soul grinders found in this portion of the citadel, and then players can advance -- that is, if the Horde and Alliance forces can overcome the foes who confront them.

The name for this instance might be inspired by the Forge of Souls of the Warhammer 40.000 universe: a workshop which crafts the unholy weapons of Daemons. Among its creations are the Soul Grinders, terrible machines fused with daemons.